on the rebound
Reacting to or recovering from an unhappy experience, especially the end of a love affair. For example, A month after breaking up with Larry, Jane got engaged to Bob, a classic case of being on the rebound. This metaphoric term, alluding to the bouncing back of a ball, has been used in the present sense since the mid-1800s, although rebound alone had been used figuratively for much longer.
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